With best wishes.
　　致以我誠摯的祝福
　　I‘m looking forward to hearing from you.
　　期待您的回信
　　I‘d appreciate it if you could reply earlier.
　　如果您能盡早回復我會萬分感激
　　I sincerely hope this letter can draw your attention to the matter and I hope the problem mentioned above can solved as soon as possible.
　　我衷心希望這封信可以引起您的注意，并且也希望以上問題能夠及早得到解決。